Display device

Abstract

A display device includes first to third anode electrodes on a pixel circuit layer and apart from each other, a first resonance auxiliary structure on the second anode electrode and having a first thickness, a second resonance auxiliary structure on the third anode electrode and having a second thickness, a first sub-anode electrode on the first anode electrode and in contact with the first anode electrode, a second sub-anode electrode on the second anode electrode to cover the first resonance auxiliary structure and in contact with the second anode electrode, a third sub-anode electrode on the third anode electrode to cover the second resonance auxiliary structure and in contact with the third anode electrode, a cathode electrode on the first to third anode electrodes, and an emission stack layer between the cathode electrode and the first to third sub-anode electrodes and including first to third emission layers sequentially stacked therein.

What is claimed is: 
     
         1 . A display device comprising:
 first to third anode electrodes disposed on a pixel circuit layer and spaced apart from each other;   a first resonance auxiliary structure disposed on the second anode electrode and having a first thickness;   a second resonance auxiliary structure disposed on the third anode electrode and having a second thickness greater than the first thickness;   a first sub-anode electrode disposed on the first anode electrode and in electrical contact with the first anode electrode;   a second sub-anode electrode disposed on the second anode electrode to cover the first resonance auxiliary structure and in electrical contact with the second anode electrode;   a third sub-anode electrode disposed on the third anode electrode to cover the second resonance auxiliary structure and in electrical contact with the third anode electrode;   a cathode electrode disposed on the first to third anode electrodes; and   an emission stack layer disposed between the cathode electrode and the first to third sub-anode electrodes, wherein the emission stack layer comprises a first emission layer, a second emission layer, and a third emission layer, which are sequentially stacked one on another.   
     
     
         2 . The display device of  claim 1 , wherein the first and second resonance auxiliary structures each include an inorganic insulating material. 
     
     
         3 . The display device of  claim 1 , wherein the first to third sub-anode electrodes each include a light transmissive metal oxide. 
     
     
         4 . The display device of  claim 1 , wherein the first emission layer emits light in a first wavelength band,
 the second emission layer emits light in a second wavelength band which is different from the first wavelength band, and   the third emission layer emits light in a third wavelength band which is different from the first and second wavelength bands.   
     
     
         5 . The display device of  claim 1 , wherein the cathode electrode includes lithium (Li)-doped silver (Ag), and
 the lithium (Li)-doped silver (Ag) includes greater than about 5 mass % and less than about 50 mass % of lithium (Li), based on a total mass of the lithium (Li)-doped silver (Ag).   
     
     
         6 . The display device of  claim 1 , further comprising a dam structure disposed between two adjacent anode electrodes among the first to third anode electrodes. 
     
     
         7 . The display device of  claim 6 , wherein the dam structure includes a same material as materials of the first and second resonance auxiliary structures. 
     
     
         8 . The display device of  claim 6 , wherein the dam structure is in contact with a top surface of each of the two adjacent anode electrodes. 
     
     
         9 . The display device of  claim 6 , further comprising a first common layer disposed between the emission stack layer and the first to third sub-anode electrodes, wherein a portion of the first common layer on a top surface of the dam structure is disconnected from a portion of the first common layer on a side surface of the dam structure. 
     
     
         10 . The display device of  claim 1 , wherein the emission stack layer is continuously disposed between the cathode electrode and the first to third sub-anode electrodes. 
     
     
         11 . A display device comprising:
 first and second anode electrodes disposed on a pixel circuit layer and spaced apart from each other;   a first resonance auxiliary structure disposed on the second anode electrode and having a first thickness;   a first sub-anode electrode disposed on the first anode electrode and in electrical contact with the first anode electrode;   a second sub-anode electrode disposed on the second anode electrode to cover the first resonance auxiliary structure and in electrical contact with the second anode electrode;   a cathode electrode disposed on the first and second anode electrodes; and   an emission stack layer disposed between the cathode electrode and the first and second sub-anode electrodes, wherein the emission stack layer comprises a first emission layer and a second emission layer, which are sequentially stacked one on another,   wherein the first emission layer emits first light having a wavelength in a range of about 440 nm to about 480 nm.   
     
     
         12 . The display device of  claim 11 , wherein the first anode electrode comprises a first reflective electrode, and
 a first optical distance between a top surface of the first reflective electrode and a bottom surface of the cathode electrode is in a range of about 700 angstroms to about 800 angstroms.   
     
     
         13 . The display device of  claim 12 , wherein a first resonance distance between the top surface of the first reflective electrode and an emission center of the first emission layer is in a range of about 250 angstroms to about 300 angstroms. 
     
     
         14 . The display device of  claim 13 , wherein the second emission layer is configured to emit second light having a wavelength in a range of about 500 nm to about 540 nm. 
     
     
         15 . The display device of  claim 14 , wherein the first thickness is in a range of about 150 angstroms to about 350 angstroms. 
     
     
         16 . The display device of  claim 13 , wherein the emission stack layer further comprises a third emission layer disposed on the second emission layer, and
 the third emission layer emits third light having a wavelength in a range of about 610 nm to about 650 nm.   
     
     
         17 . The display device of  claim 16 , further comprising:
 a third anode electrode disposed on the pixel circuit layer and spaced apart from the first and second anode electrodes;   a second resonance auxiliary structure disposed on the third anode electrode and having a second thickness; and   a third sub-anode electrode disposed on the third anode electrode to cover the second resonance auxiliary structure and in electrical contact with the third anode electrode.   
     
     
         18 . The display device of  claim 17 , wherein the second thickness is in a range of about 400 angstroms to about 600 angstroms. 
     
     
         19 . The display device of  claim 11 , wherein the emission stack layer is continuously disposed on the pixel circuit layer and the first and second sub-anode electrodes. 
     
     
         20 . The display device of  claim 11 , wherein the cathode electrode includes lithium (Li)-doped silver (Ag), and
 the lithium (Li)-doped silver (Ag) includes greater than about 5 mass % and less than about 50 mass % of lithium (Li), based on a total mass of the lithium (Li)-doped silver (Ag).